package com.cn.api.util;

public final class MD5Encoder {
	private MD5Encoder() {
		// Hide default constructor for utility class
	}

	private static final char[] hexadecimal = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd',
			'e', 'f' };

	public static String encode(byte[] binaryData) {

		if (binaryData.length != 16)
			return null;

		char[] buffer = new char[32];

		for (int i = 0; i < 16; i++) {
			int low = binaryData[i] & 0x0f;
			int high = (binaryData[i] & 0xf0) >> 4;
			buffer[i * 2] = hexadecimal[high];
			buffer[i * 2 + 1] = hexadecimal[low];
		}

		return new String(buffer);
	}

}
